Composite penetrator and shell for piles



July'3, 1928.

L. PIERCE COI POSITE PENETRAT OR AND SHELL FOR FILES Filed Oct. 25, 1927 A TTORNEY 11v VENTOR .Pierce Patented July 3, 1928.

UNITED STATES PATENT "OFFICE,

anon rmnen, or new YORK, N. Y.

conrosnrnrnnnrm'roa AND snnm ron FILES.

Application filed October 25, 1927. Serial 110.2%,566.

.10 device is used to sink the shaft, and as a consequence when the penetrator is extracted 4 with the shaft which has been formed by it the shell is retained thereon and is also withdrawn. This makes it necessary to 16 again perform the same eration until the shell remains within the s aft. 7 Another object of this invention is to provide a conical penetrator which is slipped into a hollow sleeve loosely and the space between'the sleeve and penetrator is filled, at spaced-apart positions, .with slip rods which are adapted to be extracted individually or collectivel .so that the penetrator, onremaining in the shell byitself, may 2 be easily extracted therefrom without any frictional contact between the Shell and penetrator. I Still another object of this invention is to provide a composite pile shaft penetrator I which is hollow throughout its length, having at its lower end an anvil upon which a drop hammer, contained in the pile, contacts to sink the penetrator and form a shaft thereby.

The above and other objects will become apparent in the description below, in which characters of reference refer to like-named partsin the drawing.

Referring briefly to the drawing, Figure 1 is a perspective view ofthe'composite pile shaft penetrator showin the shell mounted in 1place overthe slip re s, igure 2 is a longitudinal sectional eles vational view through the device, showing the drop hammer in partly raisedposition. Figure 3 is a cross sectionalview taken on line 3-3 of Figure 2 with several of the sli 'rods removed from place.

igure' is a cross-sectional view taken on line H of Figure 2 showing the supportingribs for-the anvil eferrin in detail to the drawing, the numeral 10 in icates the conical wall of the pene trator body. This conical wall is open at its 56 larger end at the topandis also open at its .lower smaller end. The lower smaller end of the penetrator body is permanently closed by a rounded, preferably hemi-spherical, nose 11, which nose enters the soil first and is adapted to rest in being driven when coming to re fusal soil. Intermediate the length of the penetrator and raised somewhat above the hemi-spherical nose 11 is a rigid internal flange 12 which forms an anvil seat upon which the hammer drops. This anvil seat is supported upon substantially heavy ribs 13 which extend radially toward the center of the penetrator and longitudinally downward throughout the remainder of the length of said penetrator. The anvil seat 12 has a collar 14 seated thereon. This collar forms part of a vertical guide post mounted axially within the penetrator. The lower portion- 15 of the guide post extends downwardly from'the'lower face of the collar 14 and is threadably secured to the penetrator nose 11., The upper length-16 of the guide post 14 at a position slight above the upper end of the netrator walf 10. Near the-upper end of t 1e upper section 16 of the guide post an external flange 17 is mounted rigidly upon said gu-ideipost and serves as alimlting memher for limitin the upward stroke of a drop hammer 18 pre erably conical in shapewhich passes upwardly and downwardly in a compartment 19 within the penetrator and is adapted to strike upon the collar 14 and exert a downward thrust upon the entire device thereby. This hammer has an axial bore 20 passing therethrough in which registers the upper section 16 of the guide 0st, which latter retains said hammer travelling ina vertical course. This drop hammer is connected by sling cables 21 and 22 to the usual and commonly. used tackle, such as a pile driver or the like. The upper open end of the penetrator has a plurality of lugs 23 extending radially inward. These lugs are adapted to register in channels 24 of a re movable anvil plate 25 when the latter is being fitted upon the penetraton- This removable anvil late 25, after being given a short turn, wi have its surface shoulder upon the lugs and will seat upon the limiting flange 17, and is desi ed to bear the brunt of the shock of the dimer striking the plate when the penetrator is being extracted from a shaft which it has formed. The removable anvil seat has an axial open projects from. the up er face of the collar 7 ing the shell.

shell has the same conformation as the ex-' terior of the penetrator but is of relatively large dimensions and the space existing be tween the shell and the wall of the penetrator is of suiiicient dimension to permit the insertion of a plurality of slip rods 28 which have eyelets 29 formed at their upper ends. These slip rods project a short distance above the upper open end of the penetrator so that the eyelets 29 may be readily attached to some removing tackle.

The device illustrated in the drawing is an arrangement of complemental elements which depend one upon the other for the useful functioning of the whole. A drop hammer 18 is contained movably within the compartment 19 and is adapted to be used when the penetrator is either to pierce the soil or be extracted therefrom. The stroke of the drop hammer can be regulated by the tackle to strike either the collar 14 mounted upon the anvil seat 12 or, the removable anvil 25. When said drop hammer strikes the collar 14 the penetrator 10 and the shell 27 slipped over it and retained in lace through the medium of the slip r0 s 28 pierces the soil and sinks until refusal soil is met with, thereby forming a relatively long conical shaft, which shaft is reenforced by the shell. When desiring to extract the penetrator from the shaft and shell the tackle issecured to one or more of the slip rods 28 which latter is then hoisted out of place in the space between the shell and penetrator. It will be noted that these slip rods at their lower ends have a long taper 30 formed thereon so that these lower ends will not puncture the shell when being inserted in place between the penetrator and shell. After one or more of these slip rods have been removed, the penetrator fits loosely in the shell and may be readily extracted by permitting the drop hammer to strike on its upward stroke the removable anvil plate 25 without dan er of simultaneously extracty securing the guide post at two positions within the penetrator and making the collar 14 attached to the guide ost, serve as an anvil late upon which the ammer 18 strikes and securing the lower end ofthe guide post to the nose 11, the shock that the drop hammer exerts upon the structure is distributed over a greater length and less danger of friction is thereby liable.

It is to be noted that certain changes in form and construction may be made without departing from the spirit and scope of the invention.

I claim:

1. In a device of the class described, a

substantially conical penetrator, a drop hammer slidably mounted therein, a shell of the same conformity of the penetrator loosely fitted over the latter, means for frictionally securing the shell to the penetrator, said means being capable of withdrawal to assist in relieving the penetrator, and means for jarring said penetrator on the upward or downward stroke of the hammer.

2. In a device of the class described, a substantially conical penetrator, a drop hammer movable longitudinally therein, a shell having substantially the same shape of the penetrator loosely fitting, over the latter, said shell and penetrator having a space therebetween, a plurality of slide rods arranged in spaced-apart relation in the space between the shell and penetrator, and means formed in the penetrator for jarring said penetrator on the upward or downward stroke ofthe hammer.

3. In a device of the class described, a hollow substantially conical penetrator, a drop hammer movable therein, a rounded nose at the apex end of said penetrator, a shell loosely fitted over said penetrator, said shell and penetrator having a space therebetween, a plurality of slide rods arranged in spaced-apart relation in the space between the shell and penetrator, one or more of said slide rods when slipped from place freeing said penetrator from frictional contact with said shell, andmeans formed at the top and intermediate portions of said penetrator for jarring the latter on the upward or downward stroke of the hammer.

4. In a device of the class described, a hollow substantially conical penetrator, a drop hammer movable therein, a nose at the apex end of said penetrator, a shell loosely fitted over said penetrator, said, shell and penetrator having a space therebetween, a

plurality of slide rods arranged in spacedapart relation in the space between the shell and penetrator, one. or more of said slide rods when slipped from place freeing said penetrator from frictional contact with said shell, and said slip rods having tapering lower ends, the upper ends of said slip rods having eyelets therein, and means formed at the top and intermediate portions of said penetrator for jarring the latter on the up ward or downward stroke of the hammer.

5. In a device of the class described, a penetrator, a shell having substantially the same shape as the penetrator and loosely fitting over the latter, said shell and penetrator having a space therebetween, means arranged in said space and frictionally engaging the shell and the penetrator to hold the same together, said means being removable from said space to facilitate withdrawal of the penetrator from the shell.

6. In a device of the class described, a penetrator, means arranged therein for driv- 6 ing said penetrator, a shell having substantially the same shape as the penetrator and loosely fitting over the latter, whereby a space is formed between the shell and penetrator, means arranged in said space to cause said shell and penetrator to frictionally hold I the parts together, said last named means being removable from said space to facilitate withdrawal of thepenetrator from the shell.

7. Ina device of the class described, a

' hollow substantially conical penetrator having a rounded nose thereon, a guide post secured to said nose and extending longitudinally within said penetrator, a drop harnnier slidably mounted on said guide post, means on said penetrator engageable by said hammer to jar the penetrator on the upward or downward stroke of the hammer, a shell having substantially the same shape as the penetrator and loosely fitting over the latter, whereby a space is formed between the penetrator and shell, and removable means extending into said space to frictionally hold the penetrator and shell together.

In testimony whereof I affix my signature.

LEON PIERCE. 

